Add GET /enhance/prompts: recent distinct Enhance prompts

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -507,6 +507,10 @@ GET  /enhance/templates
 POST /enhance  {"path","template","prompt"?,"reference_path"?,"library"?}  -> job
 GET  /enhance/jobs/{id}              -> job
 GET  /enhance/jobs?path=&library=    -> {"jobs": [job, ...]}  newest first, discarded hidden
+GET  /enhance/prompts?templates=a,b&limit=10  (templates optional = all; limit 1..50, default 10)
+  -> {"prompts": [{"prompt","template","last_used","uses"}]}  distinct trimmed prompts, newest
+     use first; template/last_used from the newest job; discarded + failed jobs count;
+     DB only (no library scope, answers even when ComfyUI is down or Enhance is off)
 GET  /enhance/jobs/{id}/preview/{n}  -> the staged PNG (relayed from ComfyUI /view)
 POST /enhance/jobs/{id}/approve {"n"} -> a /image/versions `versions[]` entry
 POST /enhance/jobs/{id}/discard      -> job (hidden from the list; ComfyUI untouched)